OMAP3/4 clock: split into per-chip family files

clock34xx_data.c now contains data for the OMAP34xx family, the
OMAP36xx family, and the OMAP3517 family, so rename it to
clock3xxx_data.c.  Rename clock34xx.c to clock3xxx.c, and move the
chip family-specific clock functions to clock34xx.c, clock36xx.c, or
clock3517.c, as appropriate.  So now "clock3xxx.*" refers to the OMAP3
superset.

The main goal here is to prepare to compile chip family-specific clock
functions only for kernel builds that target that chip family.  To get to
that point, we also need to add CONFIG_SOC_* options for those other
chip families; that will be done in future patches, planned for 2.6.35.

OMAP4 is also affected by this.  It duplicated the OMAP3 non-CORE DPLL
clkops structure.  The OMAP4 variant of this clkops structure has been
removed, and since there was nothing else currently in clock44xx.c, it
too has been removed -- it can always be added back later when there
is some content for it.  (The OMAP4 clock autogeneration scripts have been
updated accordingly.)

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Ranjith Lohithakshan <ranjithl@ti.com>
Cc: Tony Lindgren <tony@atomide.com>

1 files changed, 145 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clock3xxx.c b/arch/arm/mach-omap2/clock3xxx.c
new file mode 100644
index 000000000000..d142457cd041
--- /dev/null
+++ b/arch/arm/mach-omap2/clock3xxx.c
@@ -0,0 +1,145 @@
+/*
+ * OMAP3-specific clock framework functions
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Copyright (C) 2007-2010 Nokia Corporation
+ *
+ * Paul Walmsley
+ * Jouni Högander
+ *
+ * Parts of this code are based on code written by
+ * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+
+#include <plat/cpu.h>
+#include <plat/clock.h>
+
+#include "clock.h"
+#include "clock3xxx.h"
+#include "prm.h"
+#include "prm-regbits-34xx.h"
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+
+/*
+ * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks
+ * that are sourced by DPLL5, and both of these require this clock
+ * to be at 120 MHz for proper operation.
+ */
+#define DPLL5_FREQ_FOR_USBHOST          120000000
+
+/* needed by omap3_core_dpll_m2_set_rate() */
+struct clk *sdrc_ick_p, *arm_fck_p;
+
+int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
+{
+        /*
+         * According to the 12-5 CDP code from TI, "Limitation 2.5"
+         * on 3430ES1 prevents us from changing DPLL multipliers or dividers
+         * on DPLL4.
+         */
+        if (omap_rev() == OMAP3430_REV_ES1_0) {
+                pr_err("clock: DPLL4 cannot change rate due to "
+                       "silicon 'Limitation 2.5' on 3430ES1.\n");
+                return -EINVAL;
+        }
+
+        return omap3_noncore_dpll_set_rate(clk, rate);
+}
+
+void __init omap3_clk_lock_dpll5(void)
+{
+        struct clk *dpll5_clk;
+        struct clk *dpll5_m2_clk;
+
+        dpll5_clk = clk_get(NULL, "dpll5_ck");
+        clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST);
+        clk_enable(dpll5_clk);
+
+        /* Enable autoidle to allow it to enter low power bypass */
+        omap3_dpll_allow_idle(dpll5_clk);
+
+        /* Program dpll5_m2_clk divider for no division */
+        dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
+        clk_enable(dpll5_m2_clk);
+        clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST);
+
+        clk_disable(dpll5_m2_clk);
+        clk_disable(dpll5_clk);
+        return;
+}
+
+/* Common clock code */
+
+/* REVISIT: Move this init stuff out into clock.c */
+
+/*
+ * Switch the MPU rate if specified on cmdline.
+ * We cannot do this early until cmdline is parsed.
+ */
+static int __init omap3xxx_clk_arch_init(void)
+{
+        struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck;
+        unsigned long osc_sys_rate;
+        bool err = 0;
+
+        if (!cpu_is_omap34xx())
+                return 0;
+
+        if (!mpurate)
+                return -EINVAL;
+
+        /* XXX test these for success */
+        dpll1_ck = clk_get(NULL, "dpll1_ck");
+        if (WARN(IS_ERR(dpll1_ck), "Failed to get dpll1_ck.\n"))
+                err = 1;
+
+        arm_fck = clk_get(NULL, "arm_fck");
+        if (WARN(IS_ERR(arm_fck), "Failed to get arm_fck.\n"))
+                err = 1;
+
+        core_ck = clk_get(NULL, "core_ck");
+        if (WARN(IS_ERR(core_ck), "Failed to get core_ck.\n"))
+                err = 1;
+
+        osc_sys_ck = clk_get(NULL, "osc_sys_ck");
+        if (WARN(IS_ERR(osc_sys_ck), "Failed to get osc_sys_ck.\n"))
+                err = 1;
+
+        if (err)
+                return -ENOENT;
+
+        /* REVISIT: not yet ready for 343x */
+        if (clk_set_rate(dpll1_ck, mpurate))
+                printk(KERN_ERR "*** Unable to set MPU rate\n");
+
+        recalculate_root_clocks();
+
+        osc_sys_rate = clk_get_rate(osc_sys_ck);
+
+        pr_info("Switched to new clocking rate (Crystal/Core/MPU): "
+                "%ld.%01ld/%ld/%ld MHz\n",
+                (osc_sys_rate / 1000000),
+                ((osc_sys_rate / 100000) % 10),
+                (clk_get_rate(core_ck) / 1000000),
+                (clk_get_rate(arm_fck) / 1000000));
+
+        calibrate_delay();
+
+        return 0;
+}
+arch_initcall(omap3xxx_clk_arch_init);
+
+